I’ve tried with every set of tips except for the xs, same thumping with all of them. Zero issues running almost daily with the second gens for several years. I think it’s more than fit—either oversensitive ANC or something with the composition of the tips themselves. Oddly enough, it’s not present in both ears every time. Sometimes both, sometimes just one, rarely neither. I’ve stopped gathering data because I switched to a different set of headphones.

I’ll grant you that the ANC in the third gen is fantastic. I just felt like the second gen fit themselves into my routine, whereas I have to fiddle and futz with the third gen to get them just-so so that they don’t inhibit my routine.